beyant



my improved teeth-drill. 1 tion inthe line a: x, Fig. l, showing the drill 0 attachment.

i box, `e, on a hollow shaft, as shown in Fig. l.

. To all whom it may concern: l Be it known that I, H. F. BRYANT, of Marathon, in the county of Cortland and State of `New York, have invented a new and t useful Improvement in Drill for Teeth; and I do `herebydeclare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a central longitudinal section of Fig. 2 is a cross-sec- Similar letters of reference indicate like parts. i

The design of this invention is to :supply a desideratum always existing in the profession of dentistry, andnever hitherto provided for, u i by the construction of an instrument by which t, the posterior and table surfaces of the molar 3` teeth can be drilled, and excavated for cleani. ing and filling, with equal facility to the anterior or any other parts of any of the teeth.

i A burnishedsteel or iron tube, A, closed at l the end,is attached to a neat handle, B. In the tubeAis fitted nicely a sliding rod or piston, a, which extends back into the handle B, where the end bears upon a spiral spring, b, which by its expansion forces the pistone to the exe treme end of the tube A. On the outer end fof the pistonis a rack, c, the teeth of which engagein a pinion, d, that is hung in a side UNITED STATES PATENTOFFIGE,

' H. F. BnYANnoFzMAnATHoN, `New YORK. e 1 1 .1

f DENTAL DRILL.

Specification forming part of Letters Patent No. 71,36l, dated November 26, 1867.?

A ring, f, is attached to thei piston a and i moves in a slot in thef` side of; the tube A,\fo1..` i 1 the purpose of slidingthe `pistoni back `and forth, and giving motion `to thepinio`n1d. `A"` e u delicate drill, g, for boringcavities inthe molar.; teeth, is titted on either; sdein f the hollow` shaft of the -pinion d, as shown in Fig. 2.

rlhe operation of drilling with :this instru-` ment is performed by lloldingithe drill in posiformed. .y t i i i Having thus described my invention, I claim as new and desire to secure ibyiLetters Pat-w ff entl.

The construction and arrangement of the .y l, Il slotted tube A, having side box `.episton a" 1 .i l with the rack c, operating thewpinion slid-l i ing ring f, and hollowhandle h, containingg the spiral spring, as herein set forth, for their" purpose specified.

Witnesses:

C. C. ADAMS, D. D. HUNT. t.

11n. BRYANT.; 

